Citazione Stile APA (7a Edizione)

Gray, P. (1961). The Encyclopedia of the biological sciences. Reinhold Publishing Corporation.

Citazione stile Chigago Style (17a edizione)

Gray, Peter. The Encyclopedia of the Biological Sciences. New York: Reinhold Publishing Corporation, 1961.

Citatione MLA (9a ed.)

Gray, Peter. The Encyclopedia of the Biological Sciences. Reinhold Publishing Corporation, 1961.